Grinding and polishing machine.



No. 705,593. Patented m 29, |902. c. MALDANER.

GRINDING AND POLISHING MACHINE.

(Application filed Aug. 19, 1901.)

(No Model.)

W/TNESSES IN VENTOH A TTORN E Y m: nonm's PETERS 00., Pnoroumu.WASHINGTON. n, c

UNITED STATES CHARLES MALDANER, OF CHICAGO ILLINOIS, ASSIGNOR TO CHICAGOHANDLE BAR CO., A CORPORATION OF ILLINOIS.

GRINDING AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Application filed August 19, 1901.

.To aZZ whom, it may concern.-

Be it known that 1, CHARLES MALDANER, a citizen of the United States,and a resident of Chicago, county of Cook, and State of Illil nois, haveinvented certain new and useful Improvements in Grinding and PolislringMachines, of which the following is a specification and which areillustrated in the accompanying drawings, forming a part thereof.

My invention relates to certain improvements in machines for grindingand polishing hollow tubes, and has for its objects to improve andsimplify such machines, primarily by dispensing with the complicatedmechanism employed for feeding and turning the work during the grindingoperation, the grinding wheels themselves being depended upon to give tothe tube the necessary, rotation.

In machines of the character to which this invention appertains,employing a traveling mandrel, the tube has first to be sleeved upon themandrel and secured in place and the whole then fed forward by a-feedingmechanism, the mandrel. being rotated, and thereby turning the tube,while the latter is having its surface acted uponby the grinding orpolishing wheels. In practice this is a slow and laborious process,necessitating a waste of time in securing the'tube onto the mandrel andin feeding the, same 'to. the polishingwheels, and the results attainedhave not been generally satisfactory. Equally complicated andunsatisfactory is a machine having its polishing-wheels adapted torevolve about the tube or rod to be polished the latter being heldagainst movement; and my invention has for its'aim to simplify thestructure of such and other machines and to provide a machine designedto secure the best results in the most expeditious manner; and to thisend it consists in providing a pair of grinding or polishing wheelsadapted to be driven in the samedirection, so that their adjacent facestravel in opposite directions, and a stationary mandrel which projectsforwardly and is centered between the two wheels for carrying thework,The tubing is slid on the mandrel and rotated by the wheels during thepolishing operation, but being held by the hands of the operator, whoexerts arelatent No. 705,593, dated July 29, 1902.

Serial No. 72,600. (No model.)

tarding influence thereon, it does not travel 'at the same rate ofperipheral speed as the wheels which bear againstthe same, andconsequently the surfaces of the tube are abraded or polished.

j The invention is illustrated in the accompanying drawings, in which-Figure 1 is a side elevation of a grinding and polishing machineconstructed in accordance with my invention. Fig. 2 is a plan view ofthe same. Fig. 3 is a View, partially in section, of a modified form ofmandrel or work-holding tool; and Fig. i is a longitudinal section of apiece of tubing having a closed end, such as the handle-bar stem of abicycle, with which the mandrel shown in Fig. 3 is adapted to beemployed.

I Mounted at each end of the bed-plate 10 of the table 11 of the machineare a pair of wheels 12 and 12, the former being provided with grindingor abrading surfaces while the latter are polishing or buffing wheels.There is no coaction between the two sets of wheels 12 and 12, each pairbeing designed to be employed independently of the other; but inpractice I have found it convenient to mount the grinding or abradiugand polishing wheels on the same support, as illustrated. However, asthe twopairs of wheels and the mechanism for driving the same are in allrespects alike, I shall describebut one set. Each of the wheels 12 isfixed to'a shaft 13, journaled in the boxes 14 on the upright supports14, motion being communicated to the shafts, and thereby the wheels,through the medium of belts 16, passing around the pulleys 15, keyed tothe said shafts. The wheels are designed to be driven in the samedirection, so that their adjacent faces travel in opposite directions.The supports 14* are carried by plates 17 which are adapted to slide onguide-plates 18, mounted on the table, the movement of the former beingsecured by the screw-rods 19, operated by the handwheels 20 in the usualmanner. This arrangement provides for the adjustment of the wheels 12and 12 to and from each other to adapt the machine to tubes of differentsizes.

Mounted in supports 22 at each end of the bed-plate lOand held thereinagainst move- IOU ment by set-screws 23 is a rod 21, carrying a bracket24, which is fixed to the rod by a bolt 25 and has a pair ofclamping-jaws 26 for securing and supporting, by means of a bolt 28, theremovable mandrel or tube support 27, the end of which is pointed, as at30, and projects beyond the wheels, so as to facilitate the sleeving ofthe tube thereon. The rod 21 is so disposed that the mandrel 27, bymeans of its support 24, may be properly adjusted between the grindingor polishing wheels. The rod 21, serving merely as a support for themandrel-brackets, may give place to any other form of support that maybe secured to the frame of the machine. An adjustable collar 29, mountedon the mandrel and held by a bolt 29, serves as a stop to limit themovement of the tube thereon, and for grinding or polishing an ordinarytube having open ends a mandrel consisting of a rigid bar will suffice,as the tube may be ground or polished at one end and then reversed onthe mandrel to have its other end acted upon. When, however, it isdesired to treat a tube having a closed end, such as illustrated in Fig.4, so that the tube cannot be sleeved upon the mandrel from each end, Ihave provided an adjustable or yielding mandrel. (Seen in Fig. 3.) Thiscomprises a tubular holder 31, carrying a telescopic mandrel 32, havingan adjustable collar ,37. Extending from the end of the mandrel 32 intothe tube and through the head 35 is a rod or extension 33, having a nut36 on the end to limit the outward movement of the mandrel, and a coiledspring 34, reacting between the end of the mandrel and the head 35,maintains the mandrel normally outward or in such position that the nut36 bears against the head 35, but permits the mandrel to slide into thetubular holder when required to do so by the work to be performed.

In operation,the wheels havingbeen spaced apart the proper distance, thetube to be abraded or polished is sleeved upon the mandrel 27 by handand forced in between the wheels and acted upon by the same. Theoperator grasps the tubing, using gloves or pieces of cloth forprotecting his hands, and it is turned by the action of the wheels; butbecause of its friction with the mandrel and the retarding influence ofthe hands of the operator the tube does not revolve with the sameperipheral speed as the grinding-wheels, and hence, although it isturned sufficiently to present all its circumference to thegrinding-surface, it is abraded by the action of the wheels, so as togive the necessary finish. The tube having been run between the wheelsat one of its ends is then Withdrawn and the opposite end sleeved uponthe mandrel, so that that end may be treated. When the tube has been putthrough the grinding process, it is carried to the other end of thetable and the same operation is repeated with the polishing-wheels 12.

The mandrel 27 may be j ournaled in. the support 24 in such manner as tobe capable of rotation, and in grinding or polishinga tube fitting themandrel snugly or havinga rough interior such construction would be verydesirable; otherwise the friction between the mandrel and the tube mightbe so great as to prevent the turning of the tube at all by the wheels.By making the mandrel capable of rotation the tube will always be freeto turn under the action of the grinding or polishing wheels.

In surfacing a tube having a closed end, as illustrated in Fig. 4, themodified form of mandrel is employed. The tube is first sleeved upon themandrel 32 and then passed between the wheels, as above, until the openend of the tube strikes the collar 37. Pressure on the tube, a suitableholding-tube being used, will then cause the mandrel to slide into thesleeve 31 against the resistance of the spring 34, and the tube may beground or polished its entire length, or in case it has an enlargement,such as 38, until the collar 37, which has been previously properlyadjusted, abuts against the end of the tubular holder or sleeve 31. Whenthe tube is withdrawn from the yielding mandrel,the spring 34 forces themandrel outward or into its normal position.

I claim as my invention- 1. In a tube-polishing machine, a pair ofpolishing-wheels mounted in a common plane and spaced apart to receive atube between them, means for rotating the wheels in the same direction,and a mandrel projecting between the Wheels upon which the tube mayslide and turn.

2. In a tube grinding and polishing machine, in combination, a pair ofpolishingwheels, means for rotating the wheels in the same direction,and a longitudinally-movable mandrel projecting between the wheels toreceive a tube held in the hands of the operator.

3. In a tube grinding and polishing machine, in combination, a pair ofadjustable polishing -wheels, means for rotating the wheels in the samedirection, an adjustable bracket, a removable mandrel carried by thebracket and projecting between the wheelsto receive a tube held in thehands of the operator, and means for adjusting the wheels.

4. In a tube grinding and polishing machine, in combination, asupporting-table, a pair of polishing-wheels supported from the tableand adapted to be so driven that their adjacent faces travel in oppositedirections, a bracket, and a mandrel carried by the bracket andprojecting between the wheels, the mandrel being designed toreceiveatube held in the hands of the operator to be acted upon by thewheels.

5. In a tube grinding and polishing machine, in combination, asupporting-table, a pair of polishing-wheels adjustably supported fromthe table and adapted to be so driven that their adjacent faces travelin opposite directions, a bracket, and a mandrel carried by the bracketand projecting between the wheels, the mandrel being designed to receivea tube held in the hands of the operator to be acted upon by the Wheels.

6. In a tube grinding and polishing machine, in combination, asupporting-table, a pair of polishing-Wheels supported from the tableand adapted to be so driven that their adjacent faces travel in oppositedirections, a rod mounted on'the table, a bracket carried by the rod,and a mandrel held by the bracket and projecting between the wheels, themandrel being designed to receive a tube held in the hands of theoperator to be acted upon by the Wheels. l I

7. In a tube grinding and polishing machine, in combination, asupporting-table, a pair of polishing-wheels adj ustably supported fromthe table and adapted to be so driven that their adjacent faces travelin opposite directions, a bracket, and a mandrel held by the bracket andprojecting between and extending beyond the wheels, the mandrel beingdesigned to receive a tube held in the hands of the operator to be actedupon by the wheels.

8. In a tube-polishing machine, a pair of polishing-wheels mounted in acommon plane and spaced apart to receive a tube between them, means forrotating the wheels in the same direction, and atelescopically-extensible mandrel projecting between the wheels uponwhich the tube may slide andturn.

9. In a tube grinding and polishing machine, in combination, a pair ofpolishingwheels adapted to be so driven that their adjacent faces travelin opposite directions, a bracket, and a yielding mandrel carried by thebracket and projecting between the wheels, the mandrel being designed toreceive a tube held in the hands of the operator to be acted upon by thewheels.

10. In a tube grinding and polishing machine, in combination, asupporting-table, a pair of polishing-wheels supported from the table,means for rotating the wheels in the same direction, a bracket carriedby the table, a tubular mandrel-holder held by the bracket, amandrehhaving sliding engagement with the tubularholder, projectingbetween the wheels, anda spring located in the tubular holder andadapted to force the mandrel normally outward.

A CHARLES MALDANER.

Witnesses:

LoUIs K. GILLSON, ARTHUR B. SEIBOLD.

